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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555a4b48b95fbb01175a88a88cbbc77db5c420f0ca0051bfea86d08d7a310899' 
  AND token = '1UEnHHmsHNCFDgp/Kosvl2IZ3mzZ9nHBQn6SQ1B4iPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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