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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5e5ab085a312816ed68ef563d169a08af02e01f0bec8c45b7c7af73c921860' 
  AND token = 'h0rHq7BZmedoVZ/s9zP9x3dcnUWpKx1myPobRNnHKeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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