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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb36eb006aeef17980bbefb57ecae84c67ae90d87394d480dd83f53c1e7584d' 
  AND token = 'ptae8GB1i+dkq9GYPvTaeLpntZc0+uD1OvBKj2WoubY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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