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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06cd2be70ea8a9ad6c522cdaf5c656a7ba0d32932deb3640094c5611d57ac8c8' 
  AND token = '/oDRMyv0df3Y7FXk+mgbmte2QGHQeX+/yI+N+ntc6jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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