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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00673662af99e58c52057884da13d8bd427150f8a26ec1e289e279482e99c7d' 
  AND token = 'kj6S2M5WIfzzvfHAVnU37cG5pPTboBkgqce5Z50hbS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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