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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fce8162156d19a9c7cdc4c29b6a03744dd4e768eaf79dae384126aefa7c2189' 
  AND token = 'ngpUXmbY38UtaZ1JlmdRq+4kvf/TA8eOrRLK3/Otv+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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