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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3544a754d82d8be340d54ef201ad8ad6fefa948a6966592a253b53c31055ab9' 
  AND token = 'iK9Y+rmebFVjrhxFtDVZWODUPoWttTW4QWessc3wOic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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