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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c5b2d83f6a2ff43643a8066538a1eaccc750ac6cccf3fc68ddf4b536d21c5c' 
  AND token = 'FmBAkW0Wg+hbQ6uI3LN2wwbOcx4o9HURMCqN+V6ynaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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