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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4322875ed491a73e22e4a9df345498d8f511aeccef033f9234c3c2dc35c684a3' 
  AND token = 'pZ5OpnPQOJ/SzL+V2F7dZUEY837rql/OCG+sCBnYxs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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