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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a56ba92bea5a4559bdcba206af80d504388e5ca87c4aafab024a5339ad4af3' 
  AND token = 'Qhq2yu+OYC7DqVd/in9S61Wv0SdP0eZ3xG7vdLOs0eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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