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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bd6a07eb352c6cce6e4797ada720a09ba2232560bbae8f9e9ca33f70b5e6a7' 
  AND token = 'xdN/neIxDW2XmaoQmqsVO5zgTpKeO9SqDU7DiDo8YHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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