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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcdbda1ce8b548796795d0ee5ccad057f79d3e8e9903777b5d4350296c82cfe4' 
  AND token = '8tPl4lY7c1OdQDoqkY4xyaOnXKNquJ4XVDUVKGsZtzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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