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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610da2836f5592ce60451d3176539f679d21b56eda733c9ea89e52a685183ead' 
  AND token = 'SpqoMvpjmQMYa9bqWQVGJe6u5iYiquWQyrQX7VfyKak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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