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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9434a65ccda1034cea4a2b3bbc3d21811fd023a2af336f69fd219a4f96b25fc8' 
  AND token = '/sBvQKZka6NnDAO5xarkhgi16Lg1nRuWxAKZApT6t74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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