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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54d564ef3f266f497dac74db27f84f94dd497605c66a284ff1780ec1c394b7a' 
  AND token = '3dph//8icgtuulqRiJ5WY/TmngMeikM7qtxkp2J6Bm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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