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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d116700589800e1375a014fe56275886c0ffac673fd06e1f808ec58327bd8a' 
  AND token = 'IU3T5H7pju72tW4aUdmwoX+rpQjTUOAfHXRTkXsEvnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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