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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84defeda75c503c33a70ae37277064caf12030c73cf3e6238c696e6b40566ac' 
  AND token = 'JoQyH97QgPa9wwt5PaU1xHiacvBtB573GfuZcsiqiik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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