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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fd73ef817606e3c5d30252e128ae409feeefe84b936b9d9f51ee1eedf6dd7c' 
  AND token = 'hY2DwH+lxdVlVywyQrkS8GKHcCBA95pt/r0bjNEBko4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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