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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c46772a1a51ce9f1086c4e991bd1c88f7747e8b05b2c231c8559d89c7b7c34e' 
  AND token = 'JUGVE7kTVlhR9lKXSInsPuhPk0J6W/BS250nYpdbFYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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