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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fb3212ba29d3415ee1812a7f12266e80c582903f96da0aed22c1ba736e5599' 
  AND token = 'Xc6SjvrgcMhDp6Php8BMYjBwv1AZf6lIuylq9H1bOuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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