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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad659161feaea8bb6ad149162e4305d0f28bfb26877b19c7efb10b974f9179d2' 
  AND token = 'bcS5cKdoE0FjWHr1NcKmKtFw8XljVpJoRjibdNFwXH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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