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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b82e0d75f8e926447f0f9cda0305434fa06373690203c0d09bae97de583daf9' 
  AND token = 'rBBH2FnlVfz9wc7lpZ0CuHleHdJyw+L9TqYvMMhXpNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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