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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1696a113e21fd7d6d01736c0b51978f7b1c31fe42d1216ab9265eb443a52885b' 
  AND token = '3AS0c9Xo+R5BtVLf0+g5kjV7WkJBlsUi+RLO1pAITm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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