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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424e2a42ee62298acf83bdb51b9434d7c6ce47db89ba2276e6b1af86c1ef73ba' 
  AND token = '0UuQ8r64DmqbhY+/pEnlGRck/CqXcJcntKZrByWcErU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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