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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8e716dda57c78fdb28b7bc7d35b14181b9e4ee79bd7193901fa98ac91ce4c7' 
  AND token = 'fT6UekurmVd2aOPwOzzsIzmAIHXU6wi70djzwfzBfUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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