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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0344b4745871d1612b4d258d208af5fbb41d6811e49404f52e99f55b84faf86' 
  AND token = 'NWgnpdmh6U2Ss5Bv7wtvcWS2FM3T2yWGzyxaKUYeJ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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