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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0656f20617a718e677babba97b97b6dc10d6d71fd589589e91ebcde12413b779' 
  AND token = '1yHvmsBwrMF/YZbRX58jee1P3kdz4VOCwaPGqKBP0uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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