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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c16c152887cc7f9dae13bbdeb3b36a07beb54dd2badb74288b294ba634a3cd' 
  AND token = 'xPyNbQbgauRdnqXT0SRXP8fps85sLU5ECVI1Qb3vRjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00165

JSON explain

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