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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f409e11830d0688e3a212f856d7b2199004c12657dc78c20b6defc0ee23a1761' 
  AND token = 'g8uhd97zXjakuPl0XsMxhvuKNjNn5GFldfBwY04w1pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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