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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd64bce9de7c7b4f878e9cc6ede738d1f11235e2520a5140d1b6405e1036410e' 
  AND token = 'ao9y62RY44ZdPCB9DWw8gRwVgckkjD1Vej+bJRDuI5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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