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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1985103f8e6bd98f83a46f4e714be58bcf85763705eed969f53c21faf6edaaea' 
  AND token = 'CUaD52B9aKWm9nFkp71zTwN4w7pMM3XsK5XEH7qdASw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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