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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7e2fb8c314ee4d0e49e3fc240d5b1c8e960ae110e751e82acdf6f675e040cd' 
  AND token = '06YKcDHw6Kih94XBzq0qAzaA/xt0GGo0m+me3Qgwelo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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