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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd576061ff0c7e434d697dc3e709f70c3c2ad2dfd407d00f108bf28a76d7909b9' 
  AND token = 'RIxNCJO5P/arojChf7Qt20GhO9bXckwbAscLGkOM0fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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