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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e36fb119387ffff9b1e730329f8d94d9c7f936d443dc054be2b5667ddbf973' 
  AND token = '0fs+rwQL2aTafcD6O1fhamaoVo0AZ2Sc2aH/Ycx9hrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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