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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d547c5fa8b6c5438c540dbde4e932b7081c31788f3047fc0292effaef9c4dc' 
  AND token = 'TzhNwRb93cHtbzDU5Y6E8zB2WOx89NdR3gD0w/FxyRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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