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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1914227cb248609f6596277686860ea841003197ca9d4564e522d3f7936cd6ba' 
  AND token = '4WgrgEu7jH8Fk68WeOUOtrYI3PpZ7Ylw7uQTmVDq85k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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