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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd09d405c398ff0408053af7d4eef908b7c6edb5ca6deca8546899e53cbda13' 
  AND token = 'Llb6YM/tMg88CtrrS7kJQXOYtbzFM33kZf42GQvb5pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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