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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15aba7f83f917992930ca2042d61a414912609a5be93dd1a91ed1ba1b5570374' 
  AND token = 'w3nkFE5d7NjFjb0rR7deYm8nBnEy3zY/VeIsfmEQXZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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