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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57859c8eb718a2459a7984b439bb1d2b0c68d31735352f6c727b5b531d9c9e3b' 
  AND token = 'BUAGWpPGl9bGTl2hoFlOXaEaf1vHfuEOXN8/pnI4SQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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