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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ce6cfa58f01149e68d33e718f7a58da333e08c093e22a549eeafd2315cecb5' 
  AND token = 'X0tif4HBtBaivUUJmRgSaHm59TUWeoFwH032QIdwRIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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