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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28f10c3198b3babd98b9e501e7df85d252942e1bc052c1c80eacabde77195bc' 
  AND token = 'iRIzy5NmHtygKJltMQX9Y/s/8Baj1i8QoeFSJoNbXbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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