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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2610535d6a00a5ae54ee167351bd196a6bd34f03c3ed69b30c012fbcf595a166' 
  AND token = 'YZe9qNlajYBOiWpW6nL5KVbyI+1ydsnhZhhFxegb1TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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