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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669760f8b5317ba1dcae8ff7195ddb7ce01c72359b3106383b3fff0c35e00e48' 
  AND token = 'SIgH92RXkiXer0L54pMeijgEEyNjU60Kdm+Km9avX+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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