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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ef7f585ea6342bc5d49ec6e1932b3a5c99b0918ef2381c1af3bdb1f481dac4' 
  AND token = 'XhOzcF0uAMa3Hq7bUhqPowDDLqLM3XxiLeQqH2KfNTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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