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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c56f923b7f32c6a4bfe205e595159b4b537412900553f9f75d2ada07e37b46' 
  AND token = 'EBxbU+LnWHfV3JzvEgQKXxos6tAzb3J4obflT6eCFR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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