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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbbb689192189714e4513005c6d372555ecb0e79a947d0d9f801ee6779df640' 
  AND token = 'Z8Rb1YYzce0/vIMlFjMbJI4qvzD6eChkRiMBYOJFufY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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