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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b932b8ed3838959f85ad28d01d7c04aaef9867d1b85f55452ec28c3eaa3ecefb' 
  AND token = 'XPfxvMTYluBk+3tuipLISdI6e78fRtayFeqvNzj6j3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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