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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606908dc8709eb8483d63c44f29b4f2fe8127eae05c54ea66aad1e8d3649ed24' 
  AND token = '7t4O7V7PAe3WAOhFSGUaxcGR2kcPmBXSBTEe7GkIEFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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