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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b362e4eceee1b725f369f6d969cd724f2c28d6b69256d6ca462a03f7a12b450f' 
  AND token = 'aah9F0iPsBiSk8Vrb4lFzN+fzoHJjbQj5kWX0l5OWRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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