SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17cdb3972940e04160011c62d19636a395c5ac5ed1accc75b22ee19f470be5b' 
  AND token = '8hGYqgMVP09BGBK0y5TCWiLxyjpV2U/ljYS6nwriev0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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