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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c12ce32bf5865083ecebf0bfc2075f06c2620f8dff83572913ccd8eaafd95f' 
  AND token = 'uTy/g9noKlKcJ9GEd+O9u8ldKFkl88Iu/JhFsuoQcLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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