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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d2bd10803edc62da1969ac67b8af6bb41ccf8bda4df504061a75fa1547348c' 
  AND token = 'xFgu2gvh8c3NGuBHmfasL4ZQq3yDuSwvkTFOS0n5cXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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