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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e671115169b5131459218e5117141629adbd6b88f7d58914485739bb898c7c' 
  AND token = '+qixqnqlUD1ByDtraPowi7d0WvqK+onUfqjWNKWWu0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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