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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3184a4a2c8fe5b99ba14cff0e4412a10ce7922397ff89ab35c854a24aac1baa' 
  AND token = 'YHdrCmlZo2wX0TpC0D7f4gUZctr7cufByzF3iTC46h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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