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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b9814662721bc685c7ec980af0c889c2a43f2d317af06a896d6848dc4d20d4' 
  AND token = '1qynaRg/CKrc5cNQoD0rH6xGkw3yP2x29gcaTCN04+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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