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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcdf5e9325d6ff7607662783862226a4a2d5d77ffbfd8d6e40829cd13bd08a3' 
  AND token = 'ooCo9cnH8JABTgcWO5e2VYtCevbh0sjaPx63JOeEU9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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