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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9546a8c41755349ec685b4e83e4687868b93130e83218aed4c04ba9f99d1db83' 
  AND token = 'DaUArLSgxEmcLOyz6P6PYJw32RS0xHWvcsMMt07ljYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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