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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229bbbf44eb539940132b772881962449694d33268c1ea91c0fd87b2b424bdb8' 
  AND token = 'j+0KdTbdb9paT5wUw5FGVc1/WWfOBQ8LzRabVIf6xak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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