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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2493947d990b043a829cb17d8a8b26d18ff645918be4b72f6a8c1c9f53969033' 
  AND token = 'gBsTRHapeu+2VTJcDlK40HjfZ6fSj/cq9usk2609YEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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