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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39fa43d90db030e6fbdd9b5f2266906a9e67f7a799deb8383d182f93975f043' 
  AND token = '9hTFkaEBuw8/IODJRT3CCvIdiYY28n4+U9DUiURs+G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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