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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551eeb61d6175fbb501f920bb82b651259a70c36153cd7905b1ec2f6c43db971' 
  AND token = 'bVmtHqEkbJNPJDE6PmlIvAcaVWDKB3SDvRf2eOpljLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}