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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf34d242eaae6f8f3f59bcba6e50f2c57f58f6f8e7ebce2a33b21eaa5b4a224' 
  AND token = '3UkAEKN8kjsBaA7g22dlyvlwuZRTIhp2KQoV2IOH9H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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